[Yazcedric]

Hello, folks,

I'd like to add my vote to T-mobile prepaid. You can find a good deal on eBay (for SIM card).
As Motel75 mentions, you can purchase a discounted airtime topup online, too.
I sometimes do not get good signal strength when my cellphone is located inside the building, but overall, I am satisfied with its coverage.
The SIM cards I bought had California area code, but it was very easy to change it to your local area code by contacting customer service. Representatives are very helpful.

BTW, I would NOT recommend Tracfone although its prepaid starter packages are sold at many supermarkets.
As Motel75 mentions, it is not true GSM; it looks like the firmware is locked to Tracfone even though it uses SIM card.
I put SIM unlocking code and saw that restriction is "off" on the screen, but it still did not accept other company's SIM card.
In addition, I don't recommend Tracfone due to my personal bad experience.
I used to be a customer of Tracfone simply because it was easy to purchase its package.
However, on one day, my airtime credit was suddenly "dropped" (nearly ~900 minutes' worth) without any usage (actually within 1hr!) and my term was still valid (i.e. the credit was not "expired"). Ouch!
After talking with several representatives at their customer service (well, I waited for more than an 1hr to reach a human being), they just confirmed that my credit disappeared without any explanation.
They could locate when I made last purchase of my airtime, but they could not tell me why it suddenly disappeared.

Well, I learned a hard lesson from this, but fortunately, found this PrepaidGSM website while I was looking for a prepaid US carrier.
Maybe I should thank Tracfone for increasing my knowledge...